EZ-NET http://ez-net.jp/

2015.09.26 @ Swift #2

Swift 2.0 Swift

EZ-NET http://ez-net.jp/ @es_kumagai

Xcode 5

IP Phone with

MOSA

#yidev iPhone Swift @

Swift 2.0 2015.09.16

Swift 2.0

http://www.slideshare.net/tomohirokumagai54/swift-20-cswift

SlideShare

NSObject1/5

performSelector

Selector Objective-C

performSelector

func performSelector(sel: Selector) -> Unmanaged! func performSelector(sel: Selector, withObject obj: AnyObject!) -> Unmanaged! func performSelector(sel: Selector, withObject obj1: AnyObject!, withObject obj2: AnyObject!) -> Unmanaged!

Objective-C nil

Selector

struct Selector : StringLiteralConvertible, NilLiteralConvertible

performSelector

let obj = NSString(string: "TEST.TXT")

// ObjC NSString (NSObject) let extname:String = obj.performSelector("pathExtension") .takeRetainedValue()

performSelector

let obj = NSString(string: "TEST.TXT")

// ObjC NSString (NSObject) let extname:String = obj.performSelector( "componentsSeparatedByString:", withObject: "T") .takeRetainedValue()

performSelector

let obj = NSString(string: "TEST.TXT")

// NSInteger (long) nil let length:Int = obj.performSelector("length") .takeRetainedValue()

Execution was interrupted, reason: EXC_BAD_ACCESS.

performSelector

let obj = NSString(string: "TEST.TXT")

// NSUInteger (unsigned long) let length:Int = obj.performSelector("characterAtIndex:", withObject: UInt(1)) .takeRetainedValue()

Execution was interrupted, reason: signal SIGABRT.

characterAtIndex: Range or index out of bounds.

performSelector

let obj = NSString(string: "TEST.TXT")

// NSNumber let length:Int = obj.performSelector("characterAtIndex:", withObject: NSNumber(unsignedInteger:1)) .takeRetainedValue()

Execution was interrupted, reason: signal SIGABRT.

characterAtIndex: Range or index out of bounds.

Swift performSelector

Swift performSelector

class MyClass : NSObject {

func toStringWithStr(v:String) -> String func toStringWithInt(v:Int) -> String

}

performSelector

let obj = MyClass()

// String let result:String = obj.performSelector("toStringWithStr:", withObject: "A") .takeRetainedValue()

performSelector

let obj = MyClass()

// Int let result:String = obj.performSelector("toStringWithInt:", withObject: 1) .takeRetainedValue()

performSelector

let obj = MyClass()

// NSNumber let result:String = obj.performSelector("toStringWithInt:", withObject: NSNumber(integer:1)) .takeRetainedValue()

NSNumber OKperformSelector

let obj = MyClass()

// NSNumber let result:String = obj.performSelector("toStringWithNSNumber:", withObject: NSNumber(integer:1)) .takeRetainedValue()

NSNumber OKperformSelector

let obj = MyClass()

// NSNumber let result:String = obj.performSelector("toStringWithNSNumber:", withObject: 1) .takeRetainedValue()

Swift performSelector

Swift performSelector

class MyClass : NSObject {

func asString() -> String func asInt() -> Int

}

performSelector

let obj = MyClass()

// String let value:String = obj.performSelector("asString") .takeRetainedValue()

performSelector

let obj = MyClass()

// Int let value:Int = obj.performSelector("asInteger") .takeRetainedValue()

Execution was interrupted, reason: EXC_BAD_ACCESS.

Swift performSelectorObjC & Swift

Swift performSelector

class MyClass : NSObject {

func asObjC() -> ObjCClass func asNative() -> NativeClass }

class ObjCClass : NSObject {

}

class NativeClass { }

ObjC performSelector

let obj = MyClass()

// ObjC AnyObject let result:AnyObject = obj.performSelector("asObjC") .takeRetainedValue()

// let value:Int = (result as! ObjCClass).value

Swift performSelector

let obj = MyClass()

// Swift let value:Int = obj.performSelector("asNative") .takeRetainedValue()

Execution was interrupted, reason: signal SIGABRT.

asNative: unrecognized selector sent to instance.

performSelector

performSelector

performSelectorextension NSObject { func performSelectorOnMainThread( aSelector: Selector, withObject arg: AnyObject?, waitUntilDone wait: Bool)

func performSelector( aSelector: Selector, onThread thr: NSThread, withObject arg: AnyObject?, waitUntilDone wait: Bool) func performSelectorInBackground( aSelector: Selector, withObject arg: AnyObject?) }

@objc

ObjC Swift NSObject

@objc

ObjC Swift NSObject

// NSObject @objc class SwiftClass {

}

// NSObject @objc class SwiftClass : NSObject {

}

Only classes that inherit from NSObject can be declared @objc

@objc class

// ObjC @objc protocol MyProtocol {

}

// protocol MyProtocol {

}

@objc protocol

// @objc protocol MyProtocol {

func method() }

// @objc @objc class SwiftClass : MyProtocol {

@objc func method() }

@objc protocol

@nonobjc

Objective-C

@nonobjc

class SwiftClass : NSObject { var value:Int

@nonobjc var native:Int @objc var compatible:Int }

@nonobjc

SwiftClass* instance = [[SwiftClass alloc] init];

// @nonobjc instance.value

2/5

#available

#available

// #available(*)

// OSX 10.10 #available(OSX 10.10, *)

// OSX 10.10 iOS 8.4 // #available(OSX 10.10, iOS 8.4, *)

if #available

if #available(OSX 10.10, *) {

// OSX 10.10

} else {

// OSX 10.10

}

else if #available

if #available(OSX 10.9, *) {

// OSX 10.9

} else if #available(OSX 10.10, *) {

// OSX 10.9

} else {

// OSX 10.9

}

#available

if #available(iOS 9.0, *) && value == 1 {

} Expected { after if condition

#available

// Deployment Target iOS 9.0 if #available(iOS 9.0, *) {

}

Unnecessary check for iOS; minimum deployment target ensures guard will always be true

guard #available

guard #available(OSX 10.10, *) else {

// Exit

}

// OSX 10.10 //

#available

* iOS iOSApplicationExtension OSX OSXApplicationExtension watchOS watchOSApplicationExtension

Error Handling3/5

Beta 5

Error Type

Error Type

// struct FileOperationError : ErrorType {

}

ErrorType 1

Error Type

// struct FileOperationError : ErrorType {

var _code:Int var _domain:String }

_code _domain

Error Type

// throw FileOperationError()

rethrows

rethrows rethrows

func map( transform: (Generator.Element) throws -> T ) rethrows -> [T]

func reduce( initial: T, combine: (T, Generator.Element) throws -> T ) rethrows -> T

func filter( element: (Generator.Element) throws -> Bool ) rethrows -> [Generator.Element]

rethrows rethrows

func &&( lhs: T, @autoclosure rhs: () throws -> U ) rethrows -> Bool

func ||( lhs: T, @autoclosure rhs: () throws -> U ) rethrows -> Bool

func ??( optional: T?, @autoclosure defaultValue: () throws -> T ) rethrows -> T

try?

try?

var handle:Handle? = try? File.open(path)

nil

try?

// var handle:Handle?

do {

// handle = try File.open(path)

} catch {

// nil handle = nil }

guard try?

guard let handle = try? File.open(path) else {

// Exit return

}

// return readFrom(handle)

rethrows try?

// nil let sum:Int? = try? objects.reduce(0) {

try $0 + $1.toInt() }

// let sum:Int? = try? objects .map { try $0.toInt() } .reduce(0, combine: +)

4/5

//

count(array)

map(array) { $0 }

// extension CollectionType {

var count: Index.Distance { get }

func map(f:(Generator.Element)->T)->[T]

}

// Swift 1

count(array)

map(array) { $0 }

// Swift 2

array.count

array.map { $0 }

// toString

let string = toString(value)

// String

let string = String(value)

toString

Swift 1.x 3

Swift 2.0 2

// func getPrice(price:Int, tax:Double) -> Int

// Swift 1 getPrice(100, 0.05)

// Swift 2 getPrice(100, tax: 0.05)

#

func getPrice(#price:Int) -> Int

func getPrice(price price:Int) -> Int

'#' has been removed from Swift; double up 'price price' to make the argument label the same as the parameter name

_

_

_ _ _

func action(a:Int, b:Int = 1, c:Int = 2) { }

// value.action

forEach

forEach

extension SequenceType {

func forEach( @noescape body:(Generator.Element) throws -> () ) rethrows }

for in

forEach

items.filter(isValid).forEach {

$0.activate() }

break continue return for in

// func writeTo( path:String, items:String..., permit:Int ) {

}

// writeTo(path, items:"A","B","C", permit:0o775)

// func writeTo( path:String, items:String..., permit:Int = 0o755) {

}

// writeTo(path, items:"A","B","C")

// func writeTo( path:String, items:String..., preAction:(String) -> String) {

}

// writeTo(path, items:"A","B","C") {

return parseItem($0) }

// func writeTo( path:String, items:String..., permits:Int...) {

} Only a single variadic parameter '...' is permitted

struct MyType { //

init?(string: String) { } //

init?(resource:String) {

// self.init(string: readFrom(resource)) } } nil

struct MyType { //

init?(string: String) { } //

init() {

// self.init(string: "DEFAULT")! } }

let strings = ["10", "3.5", "8", "20.8"]

// let values = strings.flatMap(Double.init)

struct Selector : StringLiteralConvertible {

init(_ str: String) init(stringLiteral value: String) }

// let sel = optionalString.map(Selector.init)

Ambiguous reference to member Selector.init

Swift 2

let string = "New in Swift 2.0"

// string.containsString("Swift")

// String.containsString(string)("Swift")

// let sorted = letters .filter { string.containsString($0) } .sort { $0 > $1 }

// let sorted = letters .filter(String.containsString(string)) .sort(>)

5/5

indirect case

// enum Cascade { indirect case Device(String, next:Cascade) case Terminate }

indirect case

// let devices:Cascade = .Device("HDD", next: .Device("DVD", next: .Device("MO", next: .Terminate)))

indirect case

indirect case

extension Cascade { var depth:Int { switch self { case .Device(_, next: let next): return 1 + next.depth case .Terminate: return 0 } } }

// devices.depth

Raw

// enum Language : String { case Swift case ObjectiveC = "Objective-C" case C case Ruby }

// Language.Swift.rawValue

Raw

OK

Swift 2.0

NSObject Error Handling

Error Handling Extension